Interestingly, if the Alloy Wheels Direct sticky is correct turbines were never OE on the R171. An 18" AMG III variant was, but one of the local cars has them, and while I really liked them on the S211, I don't think they suit the R171.
18" AMG V 16-spoke wheels in 7X25 High Sheen with Standard/Titanium Silver - Alloy Wheels Direct (46235)
Genuine 18" AMG V 16-spoke wheels in 7X25 High Sheen with Standard/Titanium Silver for your Mercedes SLK Class R171 Roadster. Quick Delivery from Alloy Wheels Direct (Part No. B66031113 & B66031114)
www.alloywheelsdirect.net